add Dockerfile

Dockerfile

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+FROM debian:stable
+#FROM emile/wheezy
+MAINTAINER Émile_morel
+
+# U-boot part 
+RUN echo deb http://www.emdebian.org/debian unstable main > /etc/apt/sources.list.d/emdebian.list
+ENV DEBIAN_FRONTEND noninteractive 
+ENV DEBCONF_NONINTERACTIVE_SEEN true 
+ENV LC_ALL C 
+ENV LANGUAGE C 
+ENV LANG C 
+RUN apt-get update
+RUN apt-get install --force-yes -y emdebian-archive-keyring
+RUN apt-get update
+
+RUN apt-get install --force-yes -y gcc-4.7-arm-linux-gnueabihf ncurses-dev uboot-mkimage build-essential git
+
+RUN ln -s /usr/bin/arm-linux-gnueabihf-gcc-4.7 /usr/bin/arm-linux-gnueabihf-gcc
+
+RUN git clone -b sunxi https://github.com/linux-sunxi/u-boot-sunxi.git /u-boot-sunxi
+RUN cd /u-boot-sunxi && make CROSS_COMPILE=arm-linux-gnueabihf A20-OLinuXino-Lime_config && make CROSS_COMPILE=arm-linux-gnueabihf-
+
+# install packages for debootstrap
+RUN apt-get install --force-yes -y debootstrap dpkg-dev qemu binfmt-support qemu-user-static dpkg-cross